As of October 19, A&E has not yet announced a Season 7 for "60 Days In." However, we may be able to predict when the release date will be announced, and when the new release date will be. Seasons 1, 2, and 3 debuted in March, August, and March, respectively (via Amazon Prime). Seasons 4, 5, and 6 debuted later each year, in December and January. As a result, Season 7 may debut next year, in January 2022.
In addition, the last release date for Season 6, "the craziest season ever" as A&E called it, was November 19, 2019 (via The Gadsden Times). The next release date may therefore happen this November. At that point, new details will likely be revealed, too.
However, COVID-19 may have caused a delay in both casting and filming. Depending on the state of certain jails, the showrunners may have a difficult time creating a safe environment for the inmates, volunteers, and crew.